CN112953253A - Unidirectional alternating current power electronic transformer topology and power balance control method thereof - Google Patents
Unidirectional alternating current power electronic transformer topology and power balance control method thereof Download PDFInfo
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- CN112953253A CN112953253A CN202110269477.XA CN202110269477A CN112953253A CN 112953253 A CN112953253 A CN 112953253A CN 202110269477 A CN202110269477 A CN 202110269477A CN 112953253 A CN112953253 A CN 112953253A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
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Abstract
The invention discloses a one-way alternating current power electronic transformer topology which is formed by connecting a VIENNA rectifier, a phase-shifted full-bridge circuit and a three-phase inverter circuit in series, wherein the phase-shifted full-bridge circuit is formed by connecting a phase-shifted full-bridge I and a phase-shifted full-bridge II which are completely consistent in series through a primary side and a secondary side, and is respectively connected with an upper half bus and a lower half bus of the VIENNA rectifier and a direct current side of a three-phase inverter; the primary sides of isolation transformers in the phase-shifted full bridge are connected in series, and two secondary windings are connected in parallel through a filter inductor after being rectified by a rectifier diode; also discloses two phase-shifted full-bridge power balance control methods; the system is simple and flexible, and the secondary rectifying circuit naturally equalizes current by adopting a transformer series connection mode; the power of the upper half bus and the lower half bus of the rectifier and the power balance of the two phase-shifted full bridges can be balanced through simple current balance control; the system has high efficiency and high power density.
Description
Technical Field
The invention belongs to the technical field of power electronic equipment and power conversion, and particularly relates to a power electronic transformer for realizing voltage conversion by using a power electronic device and a power balance control method thereof.
Background
The alternating current transformer is widely applied to a power system, can realize voltage grade conversion and primary and secondary side electrical isolation, and has the problems of single function, low controllability, high noise, heavy weight and low power density.
The power electronic transformer modulates power frequency electricity into high frequency electricity through a power electronic conversion technology, and realizes electrical isolation and voltage grade conversion through the high frequency transformer, and besides the functions of a conventional transformer, the power electronic transformer can also realize the functions of power factor control, power control, voltage amplitude, frequency control and the like. The power electronic transformer adopts a high-frequency conversion technology, and the volume of the internal high-frequency transformer is reduced along with the increase of the operating frequency, so that the size of the power electronic transformer is smaller than that of a conventional power frequency transformer under the condition of theoretically equal capacity.
At present, power electronic transformers have various topological forms, mainly face to land power grid application, and have the advantages of bidirectional power flow, high voltage level, large capacity, and relatively complex topological structure and control.
Because the voltage grade is high, a high-frequency transformer used in a power electronic transformer needs to meet the requirement of high insulation, the higher the voltage grade is, the higher the required insulation grade is, and the advantage of reducing the high-frequency transformer by improving the operating frequency is lost due to the fact that the high insulation requirement is met, so that the actual size of the power electronic transformer is far larger than that of a power frequency transformer with the same capacity at present.
Disclosure of Invention
One of the objectives of the present invention is to design a topology of unidirectional ac power electronic transformer to realize voltage class conversion, electrical isolation and unidirectional power flow in accordance with the deficiencies of the prior art.
In order to achieve the purpose, the technical scheme adopted by the invention for solving the technical problem is as follows: a one-way alternating current power electronic transformer topology is characterized in that: the inverter consists of a VIENNA rectifier, a phase-shifted full-bridge circuit and a three-phase inverter circuit which are connected in series;
the VIENNA rectifier is a three-phase six-switch topological structure composed of semiconductor switching devices S1-S6, a first switch pipeline circuit formed by serially connecting semiconductor switching devices S1-S2, a second switch pipeline circuit formed by serially connecting semiconductor switching devices S3-S4 and a third switch pipeline circuit formed by serially connecting semiconductor switching devices S5-S6 are respectively connected with an alternating current input end through reactors L1, L2 and L3, the input ends of the semiconductor switching device S1, the semiconductor switching device S3 and the semiconductor switching device S5 are respectively led out through a rectifier diode D1, a rectifier diode D3 and a rectifier diode D5 and are connected in parallel with the output ends of the semiconductor switching device S2, the semiconductor switching device S4 and the semiconductor switching device S6 to form an output upper half bus, and the input ends of the semiconductor switching devices S1, S3 and S5 are respectively led out through the rectifier diode D2, the rectifier diode D4 and the rectifier diode D6 and are connected in parallel with the output ends of the semiconductor switching device S2, The output ends of the semiconductor switch device S4 and the semiconductor switch device S6 form an output lower half bus;
the phase-shifted full-bridge circuit consists of a phase-shifted full-bridge I and a phase-shifted full-bridge II which are completely consistent, wherein the phase-shifted full-bridge I and the phase-shifted full-bridge II are connected in series at the primary side and in parallel at the secondary side; the phase-shifted full-bridge I is connected to the upper half bus bar of the VIENNA rectifier output through a support capacitor C1 and consists of two rectification output ends consisting of a primary side H-bridge consisting of semiconductor switching devices S7-S10, a resonant inductor L4, a blocking capacitor C3, high-frequency transformers T1-T2, filter inductors L5-L6, secondary side rectifier diodes D7-D8 and secondary side rectifier diodes D9-D10; the phase-shifted full bridge is connected to the lower half-bridge of the VIENNA rectifier output through a support capacitor C2, and consists of two rectification output ends consisting of a primary side H bridge consisting of semiconductor switching devices S11-S14, a resonant inductor L7, a blocking capacitor C4, high-frequency transformers T3-T4, filter inductors L8-L9, secondary side rectifier diodes D11-D12 and secondary side rectifier diodes D13-D14;
the three-phase inverter circuit is connected with the positive and negative rectification output poles of the phase-shifted full bridge I and the phase-shifted full bridge II through a direct current supporting capacitor C5, a bridge arm I formed by connecting a switch 15 and a switch 18 in series, a bridge arm I formed by connecting a switch 16 and a switch 19 in series and a bridge arm III formed by connecting a switch 17 and a switch 20 in series are connected in parallel to form the three bridge arms, the three bridge arms are connected with an alternating current output end after being connected with a reactor L10 and a triangular capacitor module, and the triangular capacitor module is formed by connecting capacitors C6-C8 in series.
In the unidirectional alternating current power electronic transformer topology, the anodes of two rectification output ends of a phase-shifted full bridge I are connected in parallel through a filter inductor L5 and a filter inductor L6, and the cathodes are directly connected in parallel; the positive electrodes of the two rectification output ends of the phase-shifted full bridge II are connected in parallel with a filter inductor L9 through a filter inductor L8, and the negative electrodes are directly connected in parallel; the positive electrodes of the rectification output ends of the phase-shifted first full bridge and the phase-shifted second full bridge are connected in parallel through a filter inductor L5, a filter inductor L6, a filter inductor L8 and a filter inductor L9, and the negative electrodes of the phase-shifted first full bridge and the phase-shifted second full bridge are directly connected in parallel.
According to the one-way alternating current power electronic transformer topology, a high-frequency transformer T1 and a high-frequency transformer T2 are directly connected in series, and two windings with middle taps are arranged on a secondary side.
Semiconductor switching devices S1-S20 adopted by a VIENNA rectifier, a phase-shifted full-bridge circuit and a three-phase inverter circuit of the unidirectional alternating current power electronic transformer topology are all MOSFETs.
The second objective of the present invention is to provide a power balance control method for the above unidirectional ac power electronic transformer, so as to achieve current, voltage and power balance of the internal power unit, including the following steps:
the same primary side currents of the high-frequency transformers T1 and T2 of the phase-shifted full bridge I are rectified by two rectification output ends of the secondary side and then respectively flow through the filter inductors L5 and L6 for automatic balancing; the current flowing through the filter inductor is detected to carry out closed-loop control, and the current balance of the filter inductors L5 and L8 can be controlled, so that the balance of the output currents of the phase-shifted full bridge I and the phase-shifted full bridge II is realized;
the same primary side currents of the high-frequency transformers T3 and T4 of the phase-shifted second full bridge are rectified by the two rectification output ends of the secondary side and then flow through the filter inductors L8 and L9 to realize automatic current balancing; the current flowing through the filter inductor is detected to carry out closed-loop control, and the current balance of the filter inductors L6 and L9 can be controlled, so that the balance of the output currents of the phase-shifted full bridge I and the phase-shifted full bridge II is realized;
meanwhile, the phase-shifted full bridge I and the phase-shifted full bridge II are connected in parallel and have the same output voltage, and the power of the upper half bus and the lower half bus of the VIENNA rectifier can be automatically balanced through the power balance of the phase-shifted full bridge I and the phase-shifted full bridge II.
The invention has the beneficial effects that:
1, a three-level conversion topology form of an IENNA rectifier, a phase-shifted full-bridge circuit and a three-phase inverter circuit is adopted, so that the functions of input-side unit power factor operation, electrical isolation, high-frequency conversion, input-output voltage grade conversion and the like can be realized;
2, the phase-shifted full-bridge circuit adopts two phase-shifted full-bridges with the primary side connected in series and the secondary side connected in parallel, thereby being beneficial to realizing high-voltage and high-power conversion by adopting a low-voltage high-current power device;
3, the primary sides of the high-frequency transformers in the phase-shifted full-bridge are directly connected in series, so that the current balance of two windings on the secondary side can be automatically realized, and the power balance of two rectifier bridges can be automatically realized after the rectifier outputs are connected in parallel;
4, the power balance of the input sides of the two phase-shifted full bridges can be realized through the balance control of the output current of the phase-shifted full bridges, so that the power of the upper half bus and the lower half bus of the VIENNA rectifier is automatically balanced;
5, by adopting the low-voltage MOSFET and the soft switching technology, the switching frequency of the power device can be further improved, and the volume of the power electronic transformer is further reduced.
Drawings
FIG. 1 is a schematic of the topology of the present invention;
FIG. 2 is a control method of power equalization of the present invention;
FIG. 3 is a waveform diagram of the three-phase 690V AC input voltage and current of the VIENNA rectifier of the present invention;
FIG. 4 shows the VIENNA rectifier output side half bus voltage, half bus output power, and bus output power;
FIG. 5 shows the output currents of two rectifier bridges at the output side of the phase-shifted full bridge, the total output current of the phase-shifted full bridge and the DC voltage;
fig. 6 is a waveform diagram of three-phase 380V ac output voltage and current.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, in order to realize voltage level conversion, electrical isolation and unidirectional power flow, the topology of the invention is composed of three parts which are connected in series, namely a VIENNA rectifier, a phase-shifted full-bridge circuit and a three-phase inverter circuit.
The VIENNA rectifier is used for rectifying three-phase alternating current into direct current with midpoint potential and is divided into an upper half bus and a lower half dc bus, the topological structures of the upper half bus and the lower half dc bus are three-phase six-switch topological structures shown in figure 1, a first switch line circuit formed by serially connecting semiconductor switching devices S1-S2, a second switch line circuit formed by serially connecting semiconductor switching devices S3-S4 and a third switch line circuit formed by serially connecting semiconductor switching devices S5-S6 are respectively connected with an alternating current input end through L1, L2 and L3, input ends of the semiconductor switching devices S1, S3 and S5 are respectively led out in parallel through a rectifier diode D1, a rectifier diode D3 and a rectifier diode D5 and then form an output upper half bus with output ends of the semiconductor switching device S2, the semiconductor switching device S4 and the semiconductor switching device S6, input ends of the semiconductor switching devices S1, S3 and S5 are respectively connected with the rectifier diode D67 2, The rectifier diode D4 and the rectifier diode D6 are led out in parallel and then form an output lower half bus together with the output ends of the semiconductor switching device S2, the semiconductor switching device S4 and the semiconductor switching device S6.
The phase-shifted full-bridge circuit is composed of a phase-shifted full-bridge I and a phase-shifted full-bridge II which are completely consistent and are connected in series at the primary side and in parallel at the secondary side. The phase-shifted full-bridge I is connected to the upper half bus bar of the VIENNA rectifier output through a support capacitor C1 and consists of two rectification output ends consisting of a primary side H-bridge consisting of semiconductor switching devices S7-S10, a resonant inductor L4, a blocking capacitor C3, high-frequency transformers T1-T2, filter inductors L5-L6, secondary side rectifier diodes D7-D8 and secondary side rectifier diodes D9-D10; the phase-shifted full bridge is connected to the lower half of the output of the VIENNA rectifier through a supporting capacitor C2 and consists of two rectification output ends consisting of a primary side H bridge consisting of semiconductor switching devices S11-S14, a resonant inductor L7, a blocking capacitor C4, high-frequency transformers T3-T4, filter inductors L8-L9, secondary side rectifier diodes D11-D12 and secondary side rectifier diodes D13-D14.
The primary sides of the phase-shifted full-bridge I and the phase-shifted full-bridge II respectively use an upper half direct current bus and a lower half direct current bus as input, the electrical isolation and the voltage conversion of the primary side and the secondary side are realized through a high-frequency transformer, and meanwhile, a soft switch control mode is adopted, so that the conversion efficiency is improved. The high-frequency transformer adopts a primary side series connection mode, and two windings on a secondary side are directly connected in parallel after rectification and filtering.
The three-phase inverter circuit is connected with the positive and negative rectification output poles of the phase-shifted full bridge I and the phase-shifted full bridge II through a direct current supporting capacitor C5, a bridge arm I formed by connecting a switch 15 and a switch 18 in series, a bridge arm I formed by connecting a switch 16 and a switch 19 in series and a bridge arm III formed by connecting a switch 17 and a switch 20 in series are connected in parallel to form the three bridge arms, the three bridge arms are connected with an alternating current output end after being connected with a reactor L10 and a triangular capacitor module, and the triangular capacitor module is formed by connecting capacitors C6-C8 in series. The three-phase inverter circuit inverts the direct-current voltage output by the phase-shifted full bridge into 3-phase alternating current for load use.
In order to realize the voltage balance of the upper half bus and the lower half bus of VIENNA and the current and power balance of the primary side and the secondary side rectifier bridges of the phase-shifted full bridge, the invention adopts a double closed-loop control strategy of closed-loop direct-current voltage and closed-loop secondary side winding current average value as shown in figure 2.
The Udc _ s is direct current voltage output by the phase-shifted full bridges, in order to achieve a stable voltage control target, PI control is carried out on the Udc _ s and a given direct current voltage Udc _ ref, the obtained output Idc _ ref is used as a reference value of total output current of each phase-shifted full bridge, the total output current of each phase-shifted full bridge is the sum of the current of each branch of a secondary side, the phase-shifted angle phi of each phase-shifted full bridge is obtained after PI control, and the required driving pulse is obtained after amplitude limiting and PWM modulation. Through two sets of current closed-loop control, two phase-shifted full-bridge output total currents (IL 5+ IL6, IL8+ IL 9) all track the same command current Idc _ ref, so the two phase-shifted full-bridge output total currents are balanced, because the two phase-shifted full-bridge outputs are connected in parallel, the same output voltage is provided, so the input power of the two phase-shifted full-bridges is balanced, meanwhile, because the two phase-shifted full-bridge input currents are balanced, the two phase-shifted full-bridge input voltages are also balanced, and the balance of the upper half bus voltage and the lower half bus voltage of the VIENNA rectifier is realized.
In addition, the output currents IL5 and IL6, IL8 and IL9 of the two rectifier bridges on the secondary sides of the two phase-shifted full bridges are naturally balanced, so that the current sampling circuit can be simplified.
The invention is further explained by the realization of the unidirectional alternating current power electronic transformer shown in figure 1 with 690V of 3 phases to 380V and 40kVA of capacity according to the principle: the three-phase alternating current power supply voltage is 690V, 1100V direct current voltage is output after VIENNA rectification, the half-bus voltage is 550V, 600V direct current bus voltage is obtained after phase-shifted full-bridge conversion, and then three-phase 380V alternating current is obtained through three-phase inversion.
Fig. 3 shows three-phase voltage and current waveforms at the ac side of the VIENNA rectifier, and it can be seen that the phases of the ac side power voltage and current are substantially the same, and the power factor approaches 1.
Fig. 4 shows the half-bus voltage, the half-bus output power, and the bus output power at the output side of the VIENNA rectifier, and it can be seen that the half-bus output power is half of the bus output power through the balance control, that is, the upper half-bus power and the lower half-bus power are balanced.
Primary currents of the phase-shifted full-bridge high-frequency transformer T1 and the phase-shifted full-bridge high-frequency transformer T2 are the same, and currents flowing through the filter inductor L5 and the filter inductor L6 after the secondary currents are rectified are automatically balanced; the current flowing through the inductor L5 and the current flowing through the inductor L8 can be controlled to be balanced by detecting the current flowing through the filter inductor to carry out closed-loop control, so that the balance of the output currents of the phase-shifted full bridge I and the phase-shifted full bridge II is realized;
primary currents of the phase-shifted full-bridge two high-frequency transformers T3 and T4 are the same, and currents flowing through the filter inductors L8 and L9 after the secondary currents are rectified are automatically balanced; the current flowing through the inductor L6 and the current flowing through the inductor L9 can be controlled to be balanced by detecting the current flowing through the filter inductor to carry out closed-loop control, so that the balance of the output currents of the phase-shifted full bridge I and the phase-shifted full bridge II is realized;
meanwhile, the phase-shifted full-bridge outputs have the same output voltage after being connected in parallel, namely the phase-shifted full-bridge I and the phase-shifted full-bridge II are balanced in power, and the automatic power balance of the upper half bus and the lower half bus of the VIENNA rectifier can be automatically realized
Primary currents of phase-shifted full-bridge one high-frequency transformers T1 and T2 (phase-shifted full-bridge two is T3 and T4) are the same, and currents flowing through filter inductors L5 and L6 (phase-shifted full-bridge two is L8 and L9) after rectification of a secondary side are automatically balanced; the current flowing through the inductor L5 (L6) and the current flowing through the inductor L8 (L9) can be controlled to be balanced by detecting the current flowing through the filter inductor to carry out closed-loop control, so that the balance of the input current and the output current of the phase-shifted full bridge I and the phase-shifted full bridge II is realized; meanwhile, the output of the phase-shifted full bridge has the same output voltage after being connected in parallel, namely the power of the phase-shifted full bridge I and the phase-shifted full bridge II is balanced, and the automatic power balance of the upper half bus and the lower half bus of the VIENNA rectifier can be automatically realized.
Fig. 5 shows that, after the above-mentioned balance control method is adopted, the two rectifier bridge output currents at the output side of the phase-shifted full bridge, the two total output currents of the phase-shifted full bridge and the direct current voltage are completely consistent, and it can be seen that the two rectifier bridge output currents at the output side of the phase-shifted full bridge are basically consistent, that is, the two phase-shifted full bridges have the same output power, so that the power of the upper half bus and the lower half bus output by the VIENNA rectifier is balanced.
Fig. 6 shows three-phase 380V ac output voltage and current, which realizes voltage level conversion and voltage isolation from three-phase 690 to three-phase 380V.
The invention adopts the phase-shifted full-bridge circuit as the intermediate isolation converter, outputs the current source, can conveniently realize the parallel connection of a plurality of phase-shifted full-bridge circuits, thereby being capable of flexibly expanding, and being particularly suitable for AC power distribution application occasions with low ground voltage level, low capacity requirement and high power density requirement, such as multi-electric aircraft, ship power systems and the like.
The above-described embodiments are merely illustrative of the principles and effects of the present invention, and some embodiments may be applied, and it will be apparent to those skilled in the art that various changes and modifications may be made without departing from the inventive concept of the present invention, and these embodiments are within the scope of the present invention.
Claims (5)
1. A one-way alternating current power electronic transformer topology is characterized in that: the inverter is formed by connecting a VIENNA rectifier, a phase-shifted full-bridge circuit and a three-phase inverter circuit in series;
the VIENNA rectifier is a three-phase six-switch topological structure composed of semiconductor switching devices S1-S6, a first switch pipeline circuit formed by serially connecting semiconductor switching devices S1-S2, a second switch pipeline circuit formed by serially connecting semiconductor switching devices S3-S4 and a third switch pipeline circuit formed by serially connecting semiconductor switching devices S5-S6 are respectively connected with an alternating current input end through reactors L1, L2 and L3, the input ends of the semiconductor switching device S1, the semiconductor switching device S3 and the semiconductor switching device S5 are respectively led out through a rectifier diode D1, a rectifier diode D3 and a rectifier diode D5 and are connected in parallel with the output ends of the semiconductor switching device S2, the semiconductor switching device S4 and the semiconductor switching device S6 to form an output upper half bus, and the input ends of the semiconductor switching devices S1, S3 and S5 are respectively led out through the rectifier diode D2, the rectifier diode D4 and the rectifier diode D6 and are connected in parallel with the output ends of the semiconductor switching device S2, The output ends of the semiconductor switch device S4 and the semiconductor switch device S6 form an output lower half bus;
the phase-shifted full-bridge circuit consists of a phase-shifted full-bridge I and a phase-shifted full-bridge II which are completely consistent, wherein the phase-shifted full-bridge I and the phase-shifted full-bridge II are connected in series at the primary side and in parallel at the secondary side; the phase-shifted full-bridge I is connected to the upper half bus bar of the VIENNA rectifier output through a support capacitor C1 and consists of two rectification output ends consisting of a primary side H-bridge consisting of semiconductor switching devices S7-S10, a resonant inductor L4, a blocking capacitor C3, high-frequency transformers T1-T2, filter inductors L5-L6, secondary side rectifier diodes D7-D8 and secondary side rectifier diodes D9-D10; the phase-shifted full bridge is connected to the lower half-bridge of the VIENNA rectifier output through a support capacitor C2, and consists of two rectification output ends consisting of a primary side H bridge consisting of semiconductor switching devices S11-S14, a resonant inductor L7, a blocking capacitor C4, high-frequency transformers T3-T4, filter inductors L8-L9, secondary side rectifier diodes D11-D12 and secondary side rectifier diodes D13-D14;
the three-phase inverter circuit is connected with the positive and negative rectification output poles of the phase-shifted full bridge I and the phase-shifted full bridge II through a direct current supporting capacitor C5, a bridge arm I formed by connecting a switch 15 and a switch 18 in series, a bridge arm I formed by connecting a switch 16 and a switch 19 in series and a bridge arm III formed by connecting a switch 17 and a switch 20 in series are connected in parallel to form the three bridge arms, the three bridge arms are connected with an alternating current output end after being connected with a reactor L10 and a triangular capacitor module, and the triangular capacitor module is formed by connecting capacitors C6-C8 in series.
2. A unidirectional ac power electronic transformer topology as recited in claim 1, wherein the positive poles of the two rectified output terminals of the phase-shifted full-bridge-one are connected in parallel through a filter inductor L5 and a filter inductor L6, and the negative poles are directly connected in parallel; the positive electrodes of the two rectification output ends of the phase-shifted full bridge II are connected in parallel with a filter inductor L9 through a filter inductor L8, and the negative electrodes are directly connected in parallel; the positive electrodes of the rectification output ends of the phase-shifted first full bridge and the phase-shifted second full bridge are connected in parallel through a filter inductor L5, a filter inductor L6, a filter inductor L8 and a filter inductor L9, and the negative electrodes of the phase-shifted first full bridge and the phase-shifted second full bridge are directly connected in parallel.
3. A unidirectional ac power electronic transformer topology as recited in claim 2, wherein the primary windings of said high frequency transformer T1 and T2 are connected directly in series, and the secondary windings are two windings with center taps.
4. A unidirectional AC power electronic transformer topology as recited in claim 3, wherein said semiconductor switching devices S1-S20 are MOSFETs.
5. A power equalization method for a unidirectional AC power electronic transformer as claimed in claim 1,
the same currents on the primary sides of the high-frequency transformers T1 and T2 of the first phase-shifted full bridge are rectified by the two rectification output ends and then respectively flow through the filter inductors L5 and L6 for automatic balancing, and the balance of the output currents of the first phase-shifted full bridge and the second phase-shifted full bridge is realized by controlling the balance of the currents flowing through the filter inductors L5 and L8;
the same current of the primary sides of the high-frequency transformers T3 and T4 of the second phase-shifted full bridge flows through the filter inductors L8 and L9 after being rectified by the two rectification output ends of the secondary side to realize automatic current balance, and the balance of the output currents of the first phase-shifted full bridge and the second phase-shifted full bridge is realized by controlling the balance of the currents flowing through the filter inductors L6 and L9;
meanwhile, the phase-shifted full bridge I and the phase-shifted full bridge II are connected in parallel and have the same output voltage, and the power of the upper half bus and the lower half bus of the VIENNA rectifier is automatically balanced through the power balance of the phase-shifted full bridge I and the phase-shifted full bridge II.
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Application publication date: 20210611 |